Lifting-jack



V UNITE STATES I PATENT'l OFFICE. I

. HILAND w. eooDwIN, 'oE MUIRASSIGNOR To HIMSELF AND SAMUEL J.

BROMLEY AND HENRY POTTER, BOTH OF BATTLE GREEK, MICHIGAN.

LlFTlNG-JAGK.

SPECIFICATION forming part of Letters Patent No. 244,587, dated July 19, .1881. v

Application filed June 14,1881. (No modelJ To all whom it may concern Be it known that I, HILAND W.Goo1)wIN, a citizen of the United States of America, residing. at' Muir, in the county of Ionia'and State vof Michigan, have invented certain new and useful Improvements inLifting-Jacks and I do hereby declare the following to 'be a full, clear, and exact description of the invention, such as-will enable others skilled in the artto which it appertains to makeand use the same, reference being had to the accom panyi-ng drawings, and to letters or figures of reference marked thereon, which form a part of this specification. Z

This invention has relation to improvements in lifting-jacks; and it consists in the novel construction and arrangement of the various parts of which its composed, whereby the lifting of heavy weights may be easily accomplished with but little exertion by the operator and it also consists in a locking device applied thereto to. prevent accidents, all of which will be hereinafter more fully explained.

The annexed drawings, to which reference is made, fully illustrate my invention, in which- Figure 1 represents a vertical sectional view of my'improved lifting-jack. Fig. 2 represents a top or plan view of the same, and Fig. 8 represents a detail View of the lockin g device.

The letter A designates the base of the jack, having secured thereto and arising therefrom four standards, 66,66 to a, between which and on all sides of the jack are spaces a a a a;

B designates the vertically-adjustable post, 7 which is forked at 12, below the middle portion, thereby forming a slot, 1), which is provided at its upper or closed end with a roller, 0 and at its lower or open end-with a pin, 11?, running crosswise the same. Said post is solid from the middle portion to the top, and is provided with projections?) b b b on each sidethereof,

with a semicircular enlargement, 0, and is'provided with a pin, 0, oniits outer face, and on its under side with a rod, '0 that passes through staples or'eyes 0 0? c secured to said lever. The outer-end, c of said rod "is bent in hook-form, while the opposite end is bent into a loop or handle, 0 Said rod is also provided with a spring, 0 for operating the same.

, Having thus given a description of the different parts of which my improved lifting-jack is composed, I will now proceed andelxplain the .manner in which itis' operated in raising and lowering weights and locking the parts to one another when the jack is in use.

Fig. l of the drawings represents the post four uprights'or standards a a a a, and the projections b b b b on its sides slide within the spaces a a a a formed between the standards aforesaid,'which-latter are connected by a band,

d, encircling the top of the jack.

In releasing the jack or the postB from the weightthe operator simply grasps the lever (l by the handle, and with one finger through the loop or handle 0 of the rod c gives the latter a gentle forward movement, which causes the hook end 0 of said rod to strike against the lower end of the spring catch or look b there- Q by forcing the latter outwardly and releasing the same from'enga-gement with the pin 0 on the head or' enlargement of the lever 0, thus allowing said lever to be raised, thereby lowering the post B by means of the roller 12 traveling upon the cam or head a, after which the rod 0 has a reverse movement by means of thespring' c encircling the same, and having one end bearing against one of the staples o and the opposite end attached to the loop of the rod aforesaid. Should a second stroke be needed in raising the post B. to a desired height, the lever G is to be slightly raised and v given a forward'movement, thus withdrawing and higher notch, thereby allowing the post to be raised so much higher-the distance from one notch to another-4n addition to that caused by the cam or head 0. Any number of notches, (1 may be formed on the post to suit different heights.

A stop-pin, d may be placed on each side of the lever O to regulate the downward movement of said lever by means of the pins aforesaid striking against the standards a a, thereby preventing the lever falling too low.

It will thus be seen by the foregoing description that in constructing my lifting-jack I attach a locking device to the post B in the shape of aflat spring. Said spring, having the perforation, connects with the pin aut0inatically on the lever, and secures by said connection the lever and post to one another, thereby preventing any accidents which are liable to happen in operating this kind of liftingjack. Again, it will be observed that by my construction ot'a jack with four standards, and placing in the center thereof the post B, I am enabled to obtain a center and direct lift to the post, and at the same time it is easily operated, simple in construction, and cheap to manufacture.

Having described this invention, what I desire to secure by Letters Patent is 1. In a liftingjack, the combination of the adjustable post B, having projections b, and forked end I), and provided with the roller W, with the standards a, secured to the base A, and the leverO operating therewith, as shown, described, and for the purpose set forth.

2. In a lifting-jack,tl1e spring catch or look I), secured to the post B, and having a perforation, b ,,in its free end for engagement with the pin 0 on the lever 0, whereby said lever and the post are locked to one another, as shown, described, and for the purpose specified.

3. In a lifting-jack, the spring catch or look b secured to the post B, operating automatically with the pin 0, the rod 0,- provided with the spring 0 for operating the same, in combination with the standards do a 61/, post B, roller b and lever O, as shown, described, and for the purpose specified.

In testimony whereof I aflix my signature in presence of two witnesses.

HILAND W. GOODWIN.

Witnesses:

J AS. W. Looms, W. D. ARNOLD. 

